单项选择题

What is the main purpose of the passage you have just heard

A．To discuss different concepts.
B．To introduce a new methodology.
C．To talk about conceptual systems.
D．To introduce a research paper.
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单项选择题
How old is the housekeeper now
A．Eighteen.
B．Twenty-eight.
C．Thirty-eight.
D．Forty-eight.
单项选择题
The landlord lived elsewhere because he ______
A．preferred doing so
B．was not rich enough
C．liked to make more money
D．he would live in a finer house
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